Add zero-config self hosting on Render (#612)

* v1 of backend implementation for self hosting

* Add docs

* Add upgrades controller

* Add global helpers for self hosting mode

* Add self host settings controller

* Conditionally show self hosting settings

* Environment and config updates

* Complete upgrade prompting flow

* Update config for forked repo

* Move configuration of github provider within class

* Add upgrades cron

* Update deploy button

* Update guides

* Fix render deployer

* Typo

* Enable auto upgrades

* Fix cron

* Make upgrade modes more clear and consistent

* Trigger new available version

* Fix logic for displaying upgrade prompts

* Finish implementation

* Fix regression

* Trigger new version

* Add i18n translations

* trigger new version

* reduce caching time for testing

* Decrease cache for testing

* trigger upgrade

* trigger upgrade

* Only trigger deploy once

* trigger upgrade

* If target is commit, always upgrade if any upgrade is available

* trigger upgrade

* trigger upgrade

* Test release

* Change back to maybe repo for defaults

* Fix lint errors

* Clearer naming

* Fix relative link

* Add abs path

* Relative link

* Update docs

test/controllers/upgrades_controller_test.rb

@@ -0,0 +1,83 @@
+require "test_helper"
+
+class UpgradesControllerTest < ActionDispatch::IntegrationTest
+  setup do
+    sign_in @user = users(:family_admin)
+
+    ENV["UPGRADES_ENABLED"] = "true"
+
+    @completed_upgrade = Upgrader::Upgrade.new(
+      "commit",
+      commit_sha: "47bb430954292d2fdcc81082af731a16b9587da3",
+      version: Semver.new("0.0.0"),
+      url: ""
+    )
+
+    @completed_upgrade.stubs(:complete?).returns(true)
+    @completed_upgrade.stubs(:available?).returns(false)
+
+    @available_upgrade = Upgrader::Upgrade.new(
+      "commit",
+      commit_sha: "47bb430954292d2fdcc81082af731a16b9587da4",
+      version: Semver.new("0.1.0"),
+      url: ""
+    )
+
+    @available_upgrade.stubs(:available?).returns(true)
+    @available_upgrade.stubs(:complete?).returns(false)
+  end
+
+  test "controller not available when upgrades are disabled" do
+    ENV["UPGRADES_ENABLED"] = "false"
+
+    post "/upgrades/acknowledge/47bb430954292d2fdcc81082af731a16b9587da3"
+    assert_response :not_found
+
+    post "/upgrades/deploy/47bb430954292d2fdcc81082af731a16b9587da3"
+    assert_response :not_found
+  end
+
+  test "should acknowledge an upgrade prompt" do
+    Upgrader.stubs(:find_upgrade).returns(@available_upgrade)
+
+    post acknowledge_upgrade_url(@available_upgrade.commit_sha)
+
+    @user.reload
+    assert_equal @user.last_prompted_upgrade_commit_sha, @available_upgrade.commit_sha
+    assert :redirect
+  end
+
+  test "should acknowledge an upgrade alert" do
+    Upgrader.stubs(:find_upgrade).returns(@completed_upgrade)
+
+    post acknowledge_upgrade_url(@completed_upgrade.commit_sha)
+
+    @user.reload
+    assert_equal @user.last_alerted_upgrade_commit_sha, @completed_upgrade.commit_sha
+    assert :redirect
+  end
+
+  test "should deploy an upgrade" do
+    Upgrader.stubs(:find_upgrade).returns(@available_upgrade)
+
+    post deploy_upgrade_path(@available_upgrade.commit_sha)
+
+    @user.reload
+    assert_equal @user.last_prompted_upgrade_commit_sha, @available_upgrade.commit_sha
+    assert :redirect
+  end
+
+  test "should rollback user state if upgrade fails" do
+    PRIOR_COMMIT = "47bb430954292d2fdcc81082af731a16b9587da2"
+    @user.update!(last_prompted_upgrade_commit_sha: PRIOR_COMMIT)
+
+    Upgrader.stubs(:find_upgrade).returns(@available_upgrade)
+    Upgrader.stubs(:upgrade_to).returns({ success: false })
+
+    post deploy_upgrade_path(@available_upgrade.commit_sha)
+
+    @user.reload
+    assert_equal @user.last_prompted_upgrade_commit_sha, PRIOR_COMMIT
+    assert :redirect
+  end
+end